The main lightning safety guide is the 30-30 rule. After you see lightning, start counting to 30. If you hear thunder before you reach 30, go indoors. Suspend activities for at least 30 minutes after the last clap of thunder.

If no shelter is available, crouch low, with as little of your body touching the ground as possible. Lightning causes electric currents along the top of the ground that can be deadly from over 100 feet away.

Stay away from concrete floors or walls. Lightning can travel through any metal wires or bars in concrete walls or flooring. Although you should move into a non-concrete structure if possible, being indoors does not automatically protect you from lightning. In fact, about one-third of lightning-strike injuries occur indoors.

Do not seek shelter under a tree or near tall objects. Lightning will search for the tallest point in an area to strike, and if you are in that area you will be in danger. With that in mind, you don’t want to be the tallest point in an area, so do not go to an open field or park.

Finally, do not go near any bodies of water, such as a pond, lake, swimming pool or open body of water such as the beach.